Alcatel-Lucent 7750 SR OS, Руководство по настройке интерфейса

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Configuration Commands
Page 280 7750 SR OS Interface Configuration Guide
Cisco HDLC monitors line status on a serial interface by exchanging keepalive request messages
with peer network devices. It also allows routers to discover IP addresses of neighbors by exchanging
Serial Link Address Resolution Protocol (SLARP) address-request and address-response messages
with peer network.
Only IES SAPs (including SAPs in VPRN service) can provision a Cisco-HDLC-capable
configuration.
clock-source
Syntax clock-source { loop-timed | node-timed | adaptive | differential }
Context config>port>tdm>ds1
config>port>tdm>ds3
config>port>tdm>e1
config>port>tdm>e3
Description
This command configures the clock for transmitted data from either the internal clock or from a clock
recovered from the line’s receive data stream.
For adaptive-timed or differential-timed options to be selected the CES CMA/MDA clock-mode
must be set for adaptive or differential respectively.
Default loop-timed
Parameters loop-timed — The link recovers the clock from the received data stream.
node-timed — The link uses the internal clock when transmitting data.
adaptive — The clock is adaptively recovered from the rate at which data is received and not from
the physical layer.
differential — The clock is recovered from differential RTP timestamp header.
crc
Syntax crc { 16 | 32 }
Context config>port>tdm>ds1>channel-group
config>port>tdm>ds3
config>port>tdm>e1>channel-group
config>port>tdm>e3
Description This command configures the precision of the cyclic redundancy check (CRC).
Default 16 for non-ATM channel groups configured under DS-1, E-1 and for non-ATM E-3 and DS-3
channel/ports.
32 for ATM channel-groups configured under DS-1 and E-1, and for ATM E-3 and DS-3 channels/
ports. The default cannot be changed.
Parameters
16 — Use 16 bit checksum for the associated port/channel.